Discussion
When the parent entity is required, cascading updates and cascading deletions should be allowed or the associated actions on the parent should be prohibited.
Answer: A
Correct answer: True
If the parent is required, no child may exist without one, so the design must ensure that the parent cannot be removed or its key changed while children refer to it. Either the change is cascaded to the children, keeping the references valid, or it is prohibited outright. Doing neither leaves orphaned children, which the requirement forbids.
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